Patent GB-1022130-A (GB)
IPC: B65H19/22
Abstract: 1,022,130. Winding webs. PAPER CONVERTING MACHINE CO. Inc. Dec. 10, 1963, No. 48610/63. Heading B6B. In a single or multi-ply web-winding machine of the type described in Specification 793,490, for winding toilet rolls &c., a modified cut-off and transfer mechanism is provided for severing the web when a roll is full and transferring the web to the new core previously prepared with adhesive. The apparatus for winding a web wherein a web is continually advanced for winding on cores moved sequentially into the path of web travel comprises a cut-off and transfer mechanism characterized by means for severing the web along a line transverse to the web path while supporting a web portion spaced rearwardly of the line in the direction of web movement to provide a free leading edge approaching the next unwound core, and means operably associated with the web severing means for urging the web portion against the unwound core. A single or multi-ply web W, Fig. 1 (not shown), is fed from a supply roll (not illustrated) over a tension controlling dancer-roller 30 and through transverse perforating and longitudinal slitting mechanisms 33, 34 and 35, before passing over the modified bed roller 36 and being wound on to cores 39 mounted on the rotatable turret as described in Specification 793,490. Cut-off and transfer mechanism.-The bed roller 36, which is driven in synchronism with a chopper roller 49 and the rest of the machine by a motor 45 is provided with a knife mechanism 51, Fig. 20, and a transfer pad mechanism 55. The knife mechanism 51 comprises a blade 58 bevelled at the top, a serrated blade 59 and pins 56, Fig. 10 (not shown), attached to a shaft 62 rotatably mounted within the bed roller 36. The transfer pad mechanism comprises individual pads 55 of synthetic plastic material attached to levers 68 fixed to a shaft 72 rotatably mounted within the bed roller 36. During the cut-off and transfer operations the knife mechanism 51 and the transfer pad mechanism 55 project radially from the peripheral surface of the bed rollers 36 through a longitudinal gap 36x, Fig. 9 (not shown). The gap is covered with two plates 62a and 72a which define a longitudinal slot S, Fig. 13 (not shown), between them, which allows for the radial projection of the blades 58 and 59. Apertures 72c in the plate 72a allow for the radial projection of the transfer pads 55. Operation.-The cut-off and transfer of the web W is illustrated in four steps by Fig. 20 and Figs. 21 to 23 (not shown). Initially the web W is being fed over the bed roller 36, Fig. 20, to the nearly completed roll 50. On the next revolution of the bed roller 36, Fig. 21, the knife mechanism 51 is projected radially to co-operate with the blade 64 mounted on the chopper roller 49 and in so doing severs the web W so that the new web is impelled on the pins 56 at a distance spaced rearwardly of its leading edge. As the bed roller 36 rotates further to the position shown in Fig. 22, the leading edge of the web is folded back on itself by a combination of centrifugal forces and the wind blast due to the rotation of the bed roller, and the transfer pads 55 are projected radially to release the web from the pins 56 and urge the leading portion of the web against the adhesive covered new web-roll core 53, Fig. 23. A solenoid is energized after a predetermined number of revolutions of the bed roller 36 to release latches thus allowing cam followers 93 and 108, Fig. 2 (not shown), to co-operate with the outer cam surface 92b of a cam ring 92. The cam ring is fixed to the frame 37 of the machine but is mounted concentrically with the axis of the bed roller. As the bed roller completes its next revolution first the knife mechanism 51 is projected radially and then the transfer pads are projected radially due to their respective cam followers 93 and 108 co-operating with the cam ring surface 92b. The inner cam surface 92a co-operates with cam followers 91 and 111 to relatch the knife and transfer pad mechanisms respectively in the retracted position.